installButtonOnToolbar: function()
{
    try
    {
        var btn = document.getElementById("my-button-id");//get our button, if it exists

        if (!btn) //if button not exists
        {
            var navBar = document.getElementById("nav-bar");
            if (!navBar)//if nav-bar exists
                return;

            var currentSet = navBar.getAttribute("currentset");
            if (!currentSet)
                currentSet = navBar.currentSet;
    
            var curSet = currentSet.split(",");
            if (curSet.indexOf("my-button-id") == -1)
            {
                var set = curSet.concat("my-button-id");
                navBar.setAttribute("currentset", set.join(","));
                document.persist("nav-bar", "currentset");
            }
            
            navBar.insertItem("my-button-id");
        }
    }
    catch(ex)
    {
        dump("Exception during installButtonOnToolbar: " + ex + "\n");
    }
},